Chau, Tran Tho. “Bài toán tương đương ngôn ngữ Trên lưới Petri Suy rộng”. Journal of Computer Science and Cybernetics 4, no. 1 (February 2, 2018): 1–8. Accessed November 4, 2025. https://jcc.vast.vn/jcc/article/view/11184.